F．含有宾语从句的主动句变被动句
带有宾语从句的句子变成被动语态时，通常用it来作为被动句的形式主语，宾语从句保留不变。
They said that he had gone abroad to
study English. 他们说他出国学英语去了。
-- It was said that he had gone abroad
to study English. 据说他出国学英语去了。
We haven't decided when we should go
camping. 我们还未决定什么时候去野营。
-- It hasn't been decided when we
should go camping. 什么时候去野营尚未决定。
提示：
带有宾语从句的句子变成被动语态时，为了简练，还可把从句的主语变为被动句的主语，从句的谓语部分还可以变为不定式短语。
We believed that he would succeed. 我们相信他会成功。
-- He was believed to succeed. 人们相信他会成功。
Father expected that I should become an
engineer. 父亲希望我成为工程师。
-- I was expected (by my father) to
become an engineer. （父亲）希望我成为工程师。
G．祈使句的被动语态
肯定的祈使句的被动语态结构是：Let
+ 宾语 + be + 过去分词；否定的祈使句的被动语态结构是：Don't
+ let + 宾语 + be + 过去分词（或Let
+ 宾语 + not + be + 过去分词）。
Move the desks into the corridor.
-- Let the desks be moved into the
corridor. 把课桌搬到走廊去。
Don't trust her.
-- Don't let her be trusted.
-- Let her not be trusted. 不要相信她。
H. 动词短语构成的被动语态
一般情况下，只有及物动词才能跟宾语，而不及物动词不能跟宾语，所以只有及物动词才有被动语态，不及物动词则没有被动语态。但有些不及物动词后面跟上介词或副词后，变成一个动词短语，相当于一个及物动词，因此就可以有被动语态。
The nurses in this hospital look after
the patients very well.
-- The patients are well looked after
by the nurses in this hospital. 病人在这所医院里被护士们照料得很周到。
They have put off the meeting till next
Saturday.
-- The meeting has been put off till
next Saturday. 会议已推迟到下周六了。
注意：
在使用被动语态时，千万不要遗漏句末的介词或副词。
Such a bad habit should be got rid of. 这样的坏习惯应该改掉。
All the important matters have now been
attended to. 所有重要的事情都得到了处理。
I. 双重被动结构
双重被动结构指的是句中谓语动词和其后的不定式均为被动结构，句子的主语既是谓语动词的承受者，同时又是不定式动作的承受者。
They asked us to discuss the problem at
once.
-- We were asked to discuss the problem
at once.
-- The problem was asked to be
discussed at once. 这个问题被要求立刻讨论。（双重被动）
She offered to buy a recorder for me.
-- A recorder was offered to be bought
for me. 有人提出要帮我买一台录音机。（双重被动）
The teacher ordered that we should take
the desk away.
-- The desk was ordered to be taken
away. 课桌被要求搬走。（双重被动）
J．下列句子变成被动语态时，要用with，不用by
Smoke filled the meeting room. 烟充满了会议室。
The meeting room was filled with smoke.
会议室里充满了烟。
A cloth covered the table. 一块布把桌子罩了起来。
The table was covered with a cloth. 桌子上铺着一块布。
K．不能变为被动语态的结构
1．受动词的限制
①表示状态的及物动词，只能用于主动语态。
某些表示状态的及物动词，如have,
own, cost, lack, want (缺乏), become (适合),
fit, resemble, fail, last, flee, benefit, hold等作谓语时，不能变为被动句。
She resembles her mother. 她像她妈妈。
He lacks self-confidence. 他缺乏自信。
This hall can hold 2,000 people. 这个大厅能容纳两千人。
②当及物动词have表示“吃饭”、“患病”、“明白”、“知道”等意思时，没有被动语态形式。
Would you have a cup of tea 你要喝杯茶吗？
She had a bad cold yesterday, and now
she is feeling much better. 昨天她得了重感冒，现在好多了。
③当动词get，take表示“懂得”、“知道”，owe表示“欠”，cost表示“使失去(生命、健康等)”的意思时，动词没有相应的被动语态。
Do you get me 你明白我的意思吗？
How do you take this passage 这段话你怎么理解？
I owe 50 pounds to you. 我欠你五十英镑。
His careless driving cost his
life. 他粗心的驾驶使他丧了命。
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